﻿using System;
using System.Collections.Generic;

namespace Abp.GeneralTree
{
    #region License and Terms

    // MoreLINQ - Extensions to LINQ to Objects
    // Copyright (c) 2008 Jonathan Skeet. All rights reserved.
    // 
    // Licensed under the Apache License, Version 2.0 (the "License");
    // you may not use this file except in compliance with the License.
    // You may obtain a copy of the License at
    // 
    //     http://www.apache.org/licenses/LICENSE-2.0
    // 
    // Unless required by applicable law or agreed to in writing, software
    // distributed under the License is distributed on an "AS IS" BASIS,
    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    // See the License for the specific language governing permissions and
    // limitations under the License.

    #endregion

    /// <summary>
    /// https://github.com/morelinq/MoreLINQ/blob/master/MoreLinq/ForEach.cs
    /// </summary>
    internal static class MoreEnumerable
    {
        /// <summary>
        /// Immediately executes the given action on each element in the source sequence.
        /// </summary>
        /// <typeparam name="T">The type of the elements in the sequence</typeparam>
        /// <param name="source">The sequence of elements</param>
        /// <param name="action">The action to execute on each element</param>
        public static void ForEach<T>(this IEnumerable<T> source, Action<T> action)
        {
            if (source == null)
            {
                throw new ArgumentNullException(nameof(source));
            }

            if (action == null)
            {
                throw new ArgumentNullException(nameof(action));
            }

            foreach (var element in source)
            {
                action(element);
            }
        }

        /// <summary>
        /// Immediately executes the given action on each element in the source sequence.
        /// Each element's index is used in the logic of the action.
        /// </summary>
        /// <typeparam name="T">The type of the elements in the sequence</typeparam>
        /// <param name="source">The sequence of elements</param>
        /// <param name="action">
        /// The action to execute on each element; the second parameter
        /// of the action represents the index of the source element.
        /// </param>
        public static void ForEach<T>(this IEnumerable<T> source, Action<T, int> action)
        {
            if (source == null)
            {
                throw new ArgumentNullException(nameof(source));
            }

            if (action == null)
            {
                throw new ArgumentNullException(nameof(action));
            }

            var index = 0;
            foreach (var element in source)
            {
                action(element, index++);
            }
        }
    }
}